Center multiple variable-length sections in parent div in CSS

Question

I have three small divs that appear inside the same parent div. The second (middle) div is variable in size, as it displays text of slightly different lengths (month names).

How do I make the center of a div align with the center of the parent div so that the first and third divs align correctly in the remaining space?

CSS still exists (but it doesn't work yet):

div.calendartitle {  //The parent
  display: block;
  width: 117px;
  height: 15px;
  border-style: solid;
  border-color: black;
  font-size: small;
  border-width: 1px;
  text-align: center;
}


div.calendartitleelement {  //The three sub-divs.
  display: block;
  float: left;
  margin-left: auto;
  margin-right: auto;
  width: 38px;
}

HTML is generated in JS:

var html = "<div class='calendartitle'>";
  html += "<div class='calendartitleelement calendertitleclickable' onclick='buildCalendar(" + previousWeekStartingDay + "," + previousMonth + ");'>&#60;&#60;</div>";
  html += "<div class='calendartitleelement'>" + months[month] + "</div>";
  html += "<div class='calendartitleelement calendertitleclickable' onclick='buildCalendar(" + nextWeekStartingDay + "," + nextMonth + ");'>&#62;&#62;</div></div>";
  $("#calendardisplay").prepend(html);

Answer 1

You should not use float left with centering properties such as margin auto. Do it.

div.calendartitleelement {  //The three sub-divs.
  display: block;
  margin:0px auto;
  min-width: 38px;
}

Answer 2

float div, margin: auto . float .

Answer 3

First put them in a wrapper div.

    <div class="wrapper">
<ul class="menu clearfix">
    <li class="item">test</li>
    <li class="item">test</li>
    <li class="item">test</li>
</ul>
</div>

<style>
.wrapper {
    text-align: center;
}

.wrapper .menu {
  display: inline-block;
  *display: inline; /* ie6/7 hack for display inline, haslayout property */
}

.wrapper .menu li {
  float: left;
}

.clearfix:after {
    content:".";
    display:block;
    height:0;
    clear:both;
    visibility:hidden;
}
.clearfix {display:inline-block;}
/* Hide from IE Mac \*/
.clearfix {display:block;}
/* End hide from IE Mac */
</style>